US3698466A - Method for continuous casting of steel - Google Patents

Method for continuous casting of steel Download PDF

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Publication number
US3698466A
US3698466A US101056A US3698466DA US3698466A US 3698466 A US3698466 A US 3698466A US 101056 A US101056 A US 101056A US 3698466D A US3698466D A US 3698466DA US 3698466 A US3698466 A US 3698466A
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United States
Prior art keywords
mold
casting
powder
melting
steel
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Expired - Lifetime
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US101056A
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English (en)
Inventor
Gerd Vogt
Hans-Peter Poeste
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Vodafone GmbH
Original Assignee
Mannesmann AG
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Publication date
Application filed by Mannesmann AG filed Critical Mannesmann AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/108—Feeding additives, powders, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/006—Continuous casting of metals, i.e. casting in indefinite lengths of tubes

Definitions

  • the present invention relates to a method for introducing casting powder into a mold as used for continuous casting of steel. It is common practice to charge the mold with a casting powder during continuous casting of a steel ingot. Usually, the same type of casting powder is used throughout the casting operation. However, in copending application, Ser. No. 22,067, filed Mar. 23, 1970, of common assignee, now US. Pat. No. 3,642,052 it has been suggested to start casting by covering the surface of themolten material in the mold with a powder of relatively low melting point to obtain rapid liquification thereof during the initial phase. This way, advantageous lubrication, as well as a controlled heat barrier and insulating effect is obtained between casting product and mold rather early in the operation. Subsequently, casting powder of higher melting point is used. i
  • a casting powder of relatively low melting point formsliquid slag in the surfacelevelof the bath in the mold; the slag is withdrawn from the mold together with the cast ingot, between ingot and mold.
  • a powder of relatively high melting point does not always establish an extensive and continuous slag layer everywhere'between ingot and mold.
  • the problem solved by the invention is to render growth of skin or shell thickness more uniform or to influence growth for obtaining effects that have an opposite tendency as compared with those inherent functions of the casting equipment, which render skin thickness growth irregular. This is particularly to be the case for casting a hollow ingot for it is often desirable to have the inner skin growth in thickness actually faster than the outer one.
  • the two powders are to differ as to melting characteristics and viscosity at operating temperature.
  • the higher melting casting powder isto be applied to become effective in the vicinity of the (normally) slower growing skin, where the heat transfer is somewhat lower than on the average.
  • the higher melting casting powder is applied to be effective along the mandrel, so that the heat transfer into and through the mandrel is enhanced, and the inner skin grows faster accordingly.
  • Speeding of growth in that manner does not increase the tendency forthe formation of cracks, as upon increasing thickness of the skin the border zone is maintained under pressure due to shrinking during solidification and cooling.
  • theinner surface of the tubular ingot can be expected to be quite smooth which is of advantage for quality and further working of the ingot. Finally, the operation is safer as a whole.
  • casting powders consist usually of particular mixtures that include high melting oxides.
  • M 0 Si0,, CaO and- C are predominantly used.
  • a powder that is to. have higher melting point has more high melting oxides than a powder that is to have a lower melting point.
  • the latter type powders may include Na 0 and CaF to enhance fluidity.
  • lt is, furthermore, suggested, to keep the differently melting powders separated in the mold by means of a refractory divider made, e.g., of ceramic material.
  • FIGURE illustrates somewhat schematically a section view through a mold operated and improved in accordance with the invention.
  • theFIGURE illustrates a water cooled mold l, coolant circulation being schematically indicated by arrowsat the mold.
  • a mandrel 3 is centrally disposed in the interior of the mold. The mandrel is likewise cooled, coolant circulation is also indicated by arrows.
  • Liquid steel 6 pours from. a distributing vessel into the mold on a continuous basis and in plural streams.
  • a surface level 11 of liquid steel is dynamically established in the mold by the continuous casting. stream while a tubular ingot 9 is withdrawn continuously from the bottom of the mold.
  • An outer, solidified skin 9a is established already on the wall of the mold l and grows in thickness in direction of withdrawal.
  • an inner solidified skin 9b forms along the mandrel and grows in thickness, essentially independently from the rate of solidification on the outer skin.
  • a tubular core 9c of still liquidous steel remains at first but decreases as to cross-sectional dimension along; the direction of withdrawal as the two skins grow and merge downstream.
  • a divider ring 13 is provided in the upper part of the l mold, circumscribing the mandrel 3 and dipping into the molten bath.
  • Ring 13 is made of refractory material, e.g., ceramic.
  • Two systems of funnels, 15 and 17, are
  • funnel system provides a first type of casting powder 19 into the ring space between the (upwardly projecting) ring 13 and mandrel 3, while funnel system 17 provides a different casting powder 21 into the ring space between ring 13 and mold 1; ring 13 prevents the two powders from mixing.
  • the arrows on top of the funnels denote replenishing feeding of the casting powders into the funnels.
  • powder 19 has higher melting point than casting powder 21. It can, thus, be seen that the higher melting casting powder provides lubricating slag along the mandrel at a higher viscosity which enhances heat transfer so that growth of skin 9b is enhanced accordingly.
  • lower melting casting powder 21 provides liquidous lubricating slag as lower viscosity.
  • the resulting greater fluidity at the operating temperature therefore, reduces heat transfer into the outer mold, reducing, of course, to be understood only on a comparative basis as to heat transfer conditions into the mandrel by operation of the two types of casting powder.
  • the melting point and the viscosity of the slag at operating temperature can be controlled.
  • the relative speedof growth of skins, 9a and 9b can be adjusted accordingly for the skins to grow equally fast in thickness or for skin 9b to grow actually faster.
  • the invention of the copending application can be practiced within the environment of the present invention by changing the composition of each of the powders as casting progresses.
  • the FIGURE serves also in principle as illustrating the different case of slab ingot casting. Assume the mold to be slightly curved (e.g., to the right) and assume further the mandrel to be removed. The high melting casting powder will be applied to the left side of the mold and low melting powder will be applied more to the right. Instead of a divider ring (13), a ceramic divider wall dipping into the molten path separates the powders and the resulting slags.
  • a method of continuous casting of steel using a mold for casting a curved ingot comprising thestep of applying different casting powders to the mold in different positions thereof for control of the heat transfer conditions along and into the mold wall, the powders selected for differing as to melting point and viscosity after melting, a lower melting powder being applied in the vicinity of the wall along the inner curved contour of the ingot.
  • the divider selected from ceramic material.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
US101056A 1969-12-30 1970-12-23 Method for continuous casting of steel Expired - Lifetime US3698466A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691965784 DE1965784A1 (de) 1969-12-30 1969-12-30 Verfahren zum Aufbringen von Giesspulver beim Stranggiessen

Publications (1)

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US3698466A true US3698466A (en) 1972-10-17

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US101056A Expired - Lifetime US3698466A (en) 1969-12-30 1970-12-23 Method for continuous casting of steel

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US (1) US3698466A (enrdf_load_stackoverflow)
DE (1) DE1965784A1 (enrdf_load_stackoverflow)
FR (1) FR2072120A1 (enrdf_load_stackoverflow)
GB (1) GB1290797A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3899324A (en) * 1973-03-16 1975-08-12 Scm Corp Flux for continuous casting of steel
US3926246A (en) * 1972-09-18 1975-12-16 Scm Corp Flux for continuous casting of steel
US3935895A (en) * 1973-06-14 1976-02-03 Vereinigte Osterreichische Eisen- Und Stahlwerke-Alpine Montan Aktiengesellschaft Continuous steel casting method
US6516870B1 (en) * 2000-05-15 2003-02-11 National Steel Corporation Tundish fluxing process

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2282248A (en) * 1941-06-21 1942-05-05 Harbison Walker Refractories Making metallic ingots
US3315323A (en) * 1962-10-04 1967-04-25 Mannesmann Ag Method of continuous casting
US3344839A (en) * 1963-11-28 1967-10-03 Soudure Electr Autogene Process for obtaining a metallic mass by fusion
US3587719A (en) * 1968-12-21 1971-06-28 Mannesmann Ag Molten metal supply apparatus for preventing oxide contamination in continuously cast steel products

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2282248A (en) * 1941-06-21 1942-05-05 Harbison Walker Refractories Making metallic ingots
US3315323A (en) * 1962-10-04 1967-04-25 Mannesmann Ag Method of continuous casting
US3344839A (en) * 1963-11-28 1967-10-03 Soudure Electr Autogene Process for obtaining a metallic mass by fusion
US3587719A (en) * 1968-12-21 1971-06-28 Mannesmann Ag Molten metal supply apparatus for preventing oxide contamination in continuously cast steel products

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926246A (en) * 1972-09-18 1975-12-16 Scm Corp Flux for continuous casting of steel
US3899324A (en) * 1973-03-16 1975-08-12 Scm Corp Flux for continuous casting of steel
US3935895A (en) * 1973-06-14 1976-02-03 Vereinigte Osterreichische Eisen- Und Stahlwerke-Alpine Montan Aktiengesellschaft Continuous steel casting method
US6516870B1 (en) * 2000-05-15 2003-02-11 National Steel Corporation Tundish fluxing process

Also Published As

Publication number Publication date
FR2072120A1 (fr) 1971-09-24
GB1290797A (enrdf_load_stackoverflow) 1972-09-27
DE1965784A1 (de) 1971-07-22

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